taping

[Bill Gruby]

Wait until you guys see some of the old horology threads, they can go to 0-160 or smaller. I have a few of these in sets with the dies to match.


Billy G"

 

[Rockytime]

00-90 were pretty common for me when I was repairing model railroad engines.

 

[Bob Korves]

I can break a 0-80 tap taking it out of the drawer...

Full disclosure: The smallest tap I have ever made a new hole with is 4-40, in aluminum. The smallest I have on hand is a 2-56.